Android ListView 分类显示（二）多布局显示

主要是实现ListView的getItemViewType和getViewTypeCount两个方法，对于分类本身也占用一个item。

package com.example.categorylistview.adapter;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.categorylistview.R;
import com.example.categorylistview.bean.ImageCategory;
import com.example.categorylistview.bean.ImageCategory.Image;

public class CategoryAdapter extends BaseAdapter{

    private static final int TYPE_CATEGORY_ITEM = 0;
    private static final int TYPE_ITEM = 1;

    private List mListData;
    private LayoutInflater mInflater;

    public CategoryAdapter(Context context, List pData) {
        mListData = pData;
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        int count = 0;

        if (null != mListData) {
            // 所有分类中item的总和是ListVIew Item的总个数
//            for (ImageCategory category : mListData) {
//                count += category.
//            }
            count = mListData.size();
        }

        return count;
    }

    @Override
    public Object getItem(int position) {
        // 同一分类内，第一个元素的索引值
        int categroyFirstIndex = 0;
        for (ImageCategory category : mListData) {
            int size = category.getItemCount();
            // 在当前分类中的索引值
            int categoryIndex = position - categroyFirstIndex;
            // item在当前分类内
            if (categoryIndex < size) {
                return category.getItem(categoryIndex);
            }
            // 索引移动到当前分类结尾，即下一个分类第一个元素索引
            categroyFirstIndex += size;
        }
        return null;
    }

    public Object getItemName(int position) {
        // 同一分类内，第一个元素的索引值
        int categroyFirstIndex = 0;
        for (ImageCategory category : mListData) {
            int size = category.getItemCount();
            // 在当前分类中的索引值
            int categoryIndex = position - categroyFirstIndex;
            // item在当前分类内
            if (categoryIndex < size) {
                 return category.categoryName;
            }
            categroyFirstIndex += size;
        }
        return null;
    }

    @Override
    public int getItemViewType(int position) {
        int categroyFirstIndex = 0;
        for (ImageCategory category : mListData) {
            int size = category.getItemCount();
            // 在当前分类中的索引值
            int categoryIndex = position - categroyFirstIndex;
            if (categoryIndex == 0) {
                return TYPE_CATEGORY_ITEM;
            }
            categroyFirstIndex += size;
        }
        return TYPE_ITEM;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        int itemViewType = getItemViewType(position);
        CategoryHolder categoryHolder;
        ViewHolder viewHolder = null;
        switch (itemViewType) {
            case TYPE_CATEGORY_ITEM:
                if (null == convertView) {
                    categoryHolder = new CategoryHolder();
                    convertView = mInflater.inflate(R.layout.category, null);
                    categoryHolder.tv_category_title = (TextView) convertView.findViewById(R.id.tv_category_title);
                    convertView.setTag(categoryHolder);
                } else {
                    categoryHolder = (CategoryHolder) convertView.getTag();
                }
                String itemName = (String) getItemName(position);
                categoryHolder.tv_category_title.setText(""+itemName);
                break;
            case TYPE_ITEM:
                if (null == convertView) {
                    convertView = mInflater.inflate(R.layout.activity_main, null);
                    viewHolder = new ViewHolder();
                    viewHolder.tv_title = (TextView) convertView.findViewById(R.id.tv_title);
                    viewHolder.iv_icon = (ImageView) convertView.findViewById(R.id.iv_icon);
                    convertView.setTag(viewHolder);
                } else {
                    viewHolder = (ViewHolder) convertView.getTag();
                }
                ImageCategory.Image image = (Image) getItem(position);
                String text = image.name+" "+image.size+" "+image.date;
                // 绑定数据
                viewHolder.tv_title.setText(text);
                viewHolder.iv_icon.setImageResource(R.drawable.logo);
                break;
        }

        return convertView;
    }

    @Override
    public boolean areAllItemsEnabled() {
        return false;
    }

    @Override
    public boolean isEnabled(int position) {
        return getItemViewType(position) != TYPE_CATEGORY_ITEM;
    }

    private class ViewHolder {
        TextView tv_title;
        ImageView iv_icon;
    }
    private static class CategoryHolder {
        TextView tv_category_title;
    }

}

public class ImageCategory {

    public String categoryName;

    public List images;

    public static class Image {

        public String name;
        public String url;
        public String size;
        public String date;

        public Image(String name, String url, String size, String date) {
            super();
            this.name = name;
            this.url = url;
            this.size = size;
            this.date = date;
        }

    }

    public Object getItem(int pPosition) {
        // Category排在第一位
        if (pPosition == 0) {
            return this;
        } else {
            return images.get(pPosition - 1);
        }
    }

    /**
     * 当前类别Item总数。Category也需要占用一个Item
     * 
     * @return
     */
    public int getItemCount() {
        return images.size() + 1;
    }

}

public class DataSource {

    public static List getCategorys(){
        List categorys = new ArrayList();
        for (int i = 0; i < 5; i++) {
            ImageCategory category = new ImageCategory();
            category.categoryName="分类"+i;
            List mImages = new ArrayList();
            for (int j = 0; j < 5; j++) {
                Image image = new Image(category.categoryName+"- 风景图片"+i,"image/path/"+j,"3"
                        ,"2015-"+i+"-2"+j);
                mImages.add(image);
            }
            category.images = mImages;
            categorys.add(category);
        }
        return categorys;
    }

}

public class MainActivity extends Activity {
    ListView mListView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = (ListView) findViewById(R.id.lv_data);

        mListView.setAdapter(new CategoryAdapter(this, DataSource.getCategorys()));

        mListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView parent, View view,
                    int position, long id) {
                String name = "";
                int type = mListView.getAdapter().getItemViewType(position);
                if (type ==CategoryAdapter.TYPE_CATEGORY_ITEM) {
                    ImageCategory category = (ImageCategory) mListView.getAdapter().getItem(position);
                    name = category.categoryName;
                }else if (type ==CategoryAdapter.TYPE_ITEM) {
                    Image category = (Image) mListView.getAdapter().getItem(position);
                    name = category.name+" - "+category.size;
                }
                Toast t = Toast.makeText(getApplicationContext(), name+"", 0);
                t.show();

            }

        });

    }
}